Key Changer: Pitch & Speed
katsushi kuroki Tools In-app purchases Contains ads
Change the key and speed of any song. Free, no time limit. A-B loop to practice.
- Downloads
- 12+
- on Google Play
- Price
- Free
- In-app purchases
- Updated
- Nov 4
- 2026 · v1.0.0
Screenshots
About Key Changer: Pitch & Speed
Change the key and tempo of any song on your phone — free, with no time limit and no account.
🎤 Singers: lower or raise the key to match your voice (karaoke practice)
🎸 Musicians: slow a song down without changing its pitch to learn it by ear
🔁 A-B loop: repeat any section until you get it
💾 Remembers the key, speed and loop of every song
🎧 Keeps playing with the screen off
🔒 Your music stays on your device
Features
• Key: ±12 semitones, pitch changes without changing the speed
• Speed: 0.5x to 2.0x, speed changes without changing the pitch
• Supports MP3, M4A/AAC, WAV, FLAC, OGG and more
• No watermark, no sign-up, works offline
How to use
1. Tap "Choose a song" and pick an audio file from your phone
2. Use − / + to change the key and the slider to change the speed
3. Set A and B to loop a section
Free to use with ads. You can remove ads with a one-time purchase. Key and speed changes are never locked.
Privacy policy: https://babyloos.github.io/privacy-policy/keychanger.html
🎤 Singers: lower or raise the key to match your voice (karaoke practice)
🎸 Musicians: slow a song down without changing its pitch to learn it by ear
🔁 A-B loop: repeat any section until you get it
💾 Remembers the key, speed and loop of every song
🎧 Keeps playing with the screen off
🔒 Your music stays on your device
Features
• Key: ±12 semitones, pitch changes without changing the speed
• Speed: 0.5x to 2.0x, speed changes without changing the pitch
• Supports MP3, M4A/AAC, WAV, FLAC, OGG and more
• No watermark, no sign-up, works offline
How to use
1. Tap "Choose a song" and pick an audio file from your phone
2. Use − / + to change the key and the slider to change the speed
3. Set A and B to loop a section
Free to use with ads. You can remove ads with a one-time purchase. Key and speed changes are never locked.
Privacy policy: https://babyloos.github.io/privacy-policy/keychanger.html
What’s new
Version 1.0.0 · Updated November 4, 2026
First release! Change the key (±12 semitones) and speed (0.5x–2.0x) of any song on your phone. A-B loop to practice, remembers your settings for each song, keeps playing with the screen off.